We　report　on　a　home-made　high-energy　hundred-picosecond　fiber-solid　hybrid　laser　system,　which　consists　of　a　high-stability　all-fiber　seed　source　and　a　high-energy　quasi-continuous-wave　laser　diode　side-pumped　Nd:YAG　regenerative　amplifier.　With　this　system,　pulse　energy　of　4　mJ　and　pulse　duration　of　302　ps　have　been　achieved　at　500　Hz　repetition　rate.　The　high-energy　picosecond　pulses　of　this　laser　amplifier　are　used　for　the　experiments　of　laser-induced　damage　in　the　PIN　photodiode.　Detection　signals　and　damage　morphologies　in　the　damage　process　have　been　observed　and　studied.　The　failure　threshold　of　26　GW　cm(-2)　has　been　obtained　under　1.82　mJ　laser　irradiation.　In　addition,　the　density　distribution　of　laser-induced　plasma　has　been　simulated　based　on　hydrodynamics　theory,　which　is　consistent　with　the　experimental　results.　Damage　behavior　indicates　that　surface　damage　of　the　PIN　photodiode　can　be　analyzed　by　deep　melting　transients　and　plasma　motion.　This　scheme　takes　advantage　of　the　combination　of　fiber　and　solid　laser　to　achieve　efficient　and　stable　energy　amplification　of　picosecond　pulses,　which　provides　a　better　laser　irradiation　source　for　studying　thermal　and　plasma　damage　of　laser-induced　damage　in　the　PIN　photodiode.